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I'm writting here since i've been having troubleshoot configuring Airport Extreme the way i want. I would like to configure it in order to enable WIFI 802.11G/A (5 GHz) and another one with WIFI 802.11N (2,4 GHz).

2. Is this the best configuration i can have in order to get the best of my network?
I need the bet performance for my network, since i'm doing 1080p HD video streaming. I have an HDD connected to my Airport Extreme and I algo have an WDTV Live Plus wich reads the content from my HDD through my network. That's whi i need the best performance possible.

First, I have to applaud the thoroughness of this post. Easily one of the best 1st posts I've seen. I'd probably be more help if my Spanish was a little better (meaning a lot better). I'm not quite sure what's going on - but your router is definitely 'n' capable and you definitely do not seem to be getting a very good link rate.

First - I'd turn off all other devices that are trying to connect - and just ensure you have a single 802.11n device trying to connect (no a,b or g devices) - to start the trouble shooting. Move the 'n' device close enough to wnsure you have good signal strength and see if it shows you with an 'n' connection. I don't have an AE (yet) so I'm not familiar with any unique menus that may be available.

First as far as I know g has never operated in the 5GHz range only a and n.
b,g and n can all operate in the 2.4GHz.
I would also switch to WPA2 personnal instead of the combo WPA/WPA2 you selected
besides better security it seems to help with signal quality.

I'm writting here since i've been having troubleshoot configuring Airport Extreme the way i want. I would like to configure it in order to enable WIFI 802.11G/A (5 GHz) and another one with WIFI 802.11N (2,4 GHz).

You can configure 802.11 A/B/G/N in the 2.4Ghz range but only 802.11G/N in the 5Ghz range. Your Model is capable of doing just that.

Unfortunately I am not and home and don't have access to my network to verify what your picture shows.